Seal for filter cartridges



w. v. KENNEDY 2,533,192

SEAL FOR FILTER CARTRIDGES Filed June 10, 1948 Dec. 5, 1950 INVEN TOR.

fl dw P0040 Attz nz s Patented Dec. s, mo

SEAL Fon mum cmramoss Walter V. Kennedy, Central Falls, 8. L, aloignor to Fram Corporation, a corporation of Rhode Island Application June 10, 1948, Serial No. 32,239 6 Claims. (01. 210-483) I This invention relates to a filter and more particularly to a replacement cartridge in a filter. Heretofore a filter has been provided by the use of a cylindrical case in which there has been inserted a compressible sock type cartridge, which by reason of the yielding nature of the cartridge forms a seal with the inner surface of the cylindrical case. In some cases there'is a center tube extending through the casing and the cartridge also similarly forms a seal with the center tube.

' One of the objects of this invention is to provide a cartridge which will seal with the casing and with the center tube for the control of the flow of the liquid through the cartridge.

Another object ofthe invention is to provide a relatively rigid cartridge which by reason of resilient gaskets or rings will provide the desired seal for the control of the flow of the liquid through the cartridge.

Another object of the invention is to provide a cartridge which will have in one portion aradial fiow and in another portion an axial flow so that the entire usable filtering material will be utilized for the collection of sludge or contaminant in the lubricant.

Another object of the invention-is to provide a cartridge which may be utilized with a slight change either in the center tube type of casing or in the casing without a center tube.

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. l is a perspective view of a filtercomplete;

Fig. 2 is a sectional view with parts broken away to better show the construction of the filter with center tube including its cartridge;

Fig. 3 is a sectional view of the cartridge alone showing the modified form of construction without a center tube in the filter.

In proceeding with this invention, I provide a rigid shell for the cartridge with abutments protruding outwardly from its outer face and between these abutments locate an O-ring seal or otherseal which will prevent passage of liquid between the cartridge and the casing at the location of the seal. Another gasket type seal is provided to engage a center tube where a center tube is present, thus permitting easy insertion or withdrawal of the removable cartridge. I also provide a controlled flow of liquid so that it will pass axially through the bottom of the 2 ridge above the seal, whereby all of the usable filtering material is utilized for the collection of sludge.

With reference to the drawings, l0 designates generally a casing which comprises a cylindrical side wall II and a bottom wall l2 providing a sump for the collection of contaminant. An

. opening I3 is provided in this bottom wall whichis closed by plug M for draining the sump from settled contaminant as occasion may require. This casing has an outlet boss 24 in the wall II to connect with a discharge conduit 25. A center tube l5 extends through the bottom wall to connect with the inlet conduit l6 and is of'a height a little less than the height of the side wall H of the casing. This center tube is internally threaded at its upper end.

A cover I! for the upper end of the cylindrical side wall H is provided having a flange l8-to engage the rolled edge IQ of the body of the casing. A threaded stud 20 is rotatably supported in the cover by a member 2| having a handle 22 and a shoulder to engage the cover so that this stud 20 may be screwed into the center tube to draw the cover tightly against a gasket 23 between the cover and the rolled edge IQ of the casing so as to provide a good sealv for the casing.

This member 2| also carries a cartridge centering member 26 in the shape of a portion of a sphere which is rockably mounted on this member 2| and held in position by the nut 21 threaded onto the stud 20.

The cartridge designated generally 33 comprises a cylindrical shell 3| usually of a thin metal material which is perforated as at 32 along its surface in its upper portion above an abutment 33 which is carried thereby. Beneath this abutment as at 34 the wall is imperforate and another abutment 35 is provided protruding radially outwardly from this cylindrical shell at the lower edge thereof. An O-ring seal 5315 located between the abutments 33 and 35 in the lower portion of the cartridge 30. This shell has a bottom wall 38 which is perforated as at 3'! and has a top wall 33 which is rounded at its outer edges so as to be nicely received within the fragmentary spherical centering member 26. A core tube 33 extends axially through the cartridge and is perforated as at 40 at a location above the plane of the abutment 33 but is imperforate in its portion below this plane as at 41. At the upper end of this center tube a gasket 42 of compressible elastically resilient material is held for cartridge below the seal and radially of the carttight engagement with the center tube I! so as to form a seal at the upper end of the center tube. This gasket is held in place by a cup 45 which fits into a recess in the top wall 38 and is welded thereto. Said cup has a perforated bottom and a collar 43 which extends upwardly beyond the center tube and is provided with a bail-like handle 44 which may be engaged to withdraw the cartridge from the casing when desired.

In cases where there is no center tube, the bottom of the cup will be replaced by a web of material 48 across the cup 45 as shown in Fig. 3,

providing a sealing bottom wall, this plug being tridge is in position in the casing. The cartridge will then be forced down and the O-ring will roll 4 prising an element of corresponding to the shape-of the casing and carrying radially extending abutment means along its outer surface. an O-ring of compressible material about said element adjacent said abutment and rollable along the surface of the element against said abutment, said element being of a diameter along the portion engaged by said O-ring smaller than the inner diameter of the casing which receives said element and said O- ring being of a cross section normally greater than the diflerences in said diameters so as to be compressed out of its normal shape and rolled against said abutment when the element is inserted in a filter casing.

2. A cartridge as in claim 1 wherein said abutment means comprises two abutments with one of said abutments at the bottom of the element and the other is spaced axially therefrom.

up against the abutment It and be forced out of enter through the conduit I6, pass up the center.

tube It to be discharged therefrom through opening 5! and will then pass through the perforated center tube through openings 40 radially outwardly or upwardly through the openings 31 and be discharged above the O-ring gasket 50 into the space provided between the rigid cartridge and the rigid casing. and thence outwardly through the conduit 25. Such contaminant as may be sufilciently heavy to settle in the oil as it is passing through the filter will be collected in the sump 53 provided by the bottom wall and may be drained therefrom by removal of the plug ll in the drainage opening ii. If it becomes necessary-to change the filtering element, the reverse of the assembly operations will be had.

While I have illustrated the cartridge and casing as cylindrical in shape, it will be apparent that other shapes may adapt themselves to us in this construction.

I claim:

'1. A cartridge for a filter having a casing com- 3. A cartridge as in claim 2 wherein said element has inner and outer cylindrical walls, said walls being imperforate along the area between said abutments and perforate .along the remainder of their extent.'-

4. A cartridge as in claim 2 wherein said element has inner and outer cylindrical walls. and an end wall, said inner and outer cylindrical walls being imperforate along the area between said abutments and perforate along the remainder of their extent, and said end wall adjacent said "abutments being perforate for the passage of liquid to be filtered. 5. A cartridge as in claim 1 wherein a center tube extends axially through said element.

6. A cartridge as in claim 1 wherein a center tube extends axially through said element. said center tube being perforated along a portion of its extent. 1

WALTER V. KENNEDY.

REFERENCES CITED The following references are of record in the file of this patent:

PATENTS Reilly Apr. 19, 1949 filterlngmaterialotashape 

